Beginning September 2 at 9am, motorists will encounter some lane closures in both directions of Miller Avenue between Sunnyside Avenue near downtown and Almonte Boulevard near Tamalpais High School as the City of Mill Valley begins the initial phase of the Miller Avenue Streetscape Project. This first phase of the project is designed to improve parking, traffic and pedestrian safety.

The right lanes of both inbound and outbound sections of Miller Avenue will be closed periodically on weekdays between 9am and 5pm from September 2–22. The lane closures will not impact the entirety of Miller Avenue simultaneously, as contractors will move from section of the road to another throughout the project.

Does this show the reduction of the two lane area to one lane? Is this for both directions? It looks like they want to make Miller as awful as East Blithedale for getting in and out of Mill Valley.
Some of do have to leave Mill Valley sometimes.